hi OP, just a comment that there are still plenty of nomadic people in the steppes, still riding horses & practicing archery, so you could consider asking them directly, e.g. /r/Mongolia, /r/Kazakhstan, /u/Kyrgyzstan, you may find some Tuvans or other in /r/Russia (certainly there are Tuvans in /r/khoomei but that's a throat-singing sub)

edit: incidentally, you might be interested in this recent exchange about horse riding: What are some examples of extreme military training from premodern history other than Sparta?

Because horses and bows were their tools. Horses as transporation, food and 'weapons'. Bows obviously as weapons, for fighting and hunting.

A nomadic civilization traversing great distances naturally will put a much higher emphasis on the importance of the horse and riding skill than other non-nomadic peoples.